If you're wondering which mulch helps plants stay hydrated longer, our test can help. We evaluated moisture retention under wood chips, cardboard mulch, and pine straw. The results were recorded using reliable soil sensors available through Lab Equipment Dealers & Suppliers Near me. Wood chips retained the most water over time, while cardboard showed promise as a low-cost option. Pine straw was better suited for short-term coverage. These results assist in selecting mulch based on plant and climate needs.